351 people took this IQ test today | Highest IQ score is 158

Measure Your IQ More Accurately

Check IQ™ is an adaptive online IQ Test. By automatically adjusting the difficulty of questions to your level, it makes the IQ assessment more accurate and quicker.

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Recent IQ test results

D**** US
United States | IQ Score: 97
D**** PT
Portugal | IQ Score: 92
D**** PT
Portugal | IQ Score: 102
P**** TH
Thailand | IQ Score: 95
D**** PT
Portugal | IQ Score: 95
J**** PT
Portugal | IQ Score: 105
D**** PT
Portugal | IQ Score: 96
D**** PT
Portugal | IQ Score: 106
Anonymous Unknown
Unknown | IQ Score: 95
Anonymous Unknown
Unknown | IQ Score: 95
Anonymous Unknown
Unknown | IQ Score: 95
Anonymous Unknown
Unknown | IQ Score: 95
A**** TH
Thailand | IQ Score: 95
D**** PT
Portugal | IQ Score: 96
D**** PT
Portugal | IQ Score: 99
D**** PT
Portugal | IQ Score: 90
D**** PT
Portugal | IQ Score: 90
D**** PT
Portugal | IQ Score: 91
D**** PT
Portugal | IQ Score: 94
d**** PT
Portugal | IQ Score: 89

Take the Leap: Why Take an IQ Test?

Taking an IQ test is not just a brain workout. An IQ test can result in a lasting impact in your personal life and in your career. Ultimately, it's about knowing yourself better, which is the key to success.

Detailed Insights & Recommendations

Create a Pivotal Moment in Your Life

Are you living up to your potential? An IQ test can be the spark of confidence you need to change your life.

Statistical Comparisons with Peers

Compare Your Cognitive Abilities With Your Peers

Your IQ score assesses your ability to use apply logic and reason, compared to rest of the population.

Unlock Career & Educational Opportunities

Unlock Career And Educational Opportunities

An IQ test helps you understand your strengths in order to find the career and educational paths that match them.

What Sets Us Appart

Scientists performing a cognitive assessment

An Adaptive Test for a Better Accuracy

Our IQ test redefines cognitive assessment with its efficient adaptive approach. Unlike standard online IQ tests that use a fixed set of questions for everyone, our test intelligently adjusts the difficulty of each question based on your previous responses.

This innovative design not only ensures a tailored challenge for each individual but also means fewer questions are needed to accurately assess your IQ. The result is a more precise and personalized measure of your intelligence, achieved in a fraction of the time typically required by traditional tests.

6,000+ Questions for Unlimited Testing

Our IQ test offers an extensive pool of over 6,000 meticulously crafted questions, developed by a team of cognitive research experts. This vast and diverse collection ensures that each time you retake the test, you'll encounter a new set of challenges, allowing for a fresh and unbiased assessment on each attempt.

These questions encompass a broad spectrum of cognitive abilities, from logical reasoning and pattern recognition to abstract reasoning and spatial awareness. Our comprehensive approach not only provides deep insights into your cognitive profile but also ensures a well-rounded and varied assessment of your intellectual potential, every time you take the test.

IQ Test question examples
IQ test reliability and validity assessment

Comprehensive & Research-Based IQ Test Questions

Our test at Check IQ™ is more than a basic online quiz. In our quest to develop a meaningful tool for measuring intelligence, we've thoroughly analyzed a wide array of IQ test standards, including widely recognized benchmarks like the Wechsler Adult Intelligence Scale (WAIS), the Stanford-Binet Intelligence Scales, and the Raven's Progressive Matrices. This extensive review has informed our approach, allowing us to integrate key elements from these established methods into our own testing procedures.

We're committed to evolving and refining our techniques in line with the latest advancements in cognitive science. The methodology we've developed, detailed on our website, is carefully crafted to enhance both reliability and validity. Through ongoing feedback and rigorous field testing, we're dedicated to continually improving Check IQ™, aiming to offer a dependable and insightful online IQ testing experience.

What People Say

IQ Data Insights


Over 63,547 test takers every month

1 in 269

2% of people have high IQ (above 140)

1 in 30,422

0.003% of people have genius IQ (above 160)

Distribution of IQ Scores Among the Population Understanding the Bell Curve of IQ Scores

IQ Under 70: Below Average

IQ 70-85: Lower Average

IQ 85-115: Average

IQ 115-130: Above Average

IQ 130-145: Gifted

IQ 145-160: Exceptionnally Gifted

IQ 160-180: Genius

IQ Above 180: Super Genius

Understanding the IQ Bell Curve

Understanding your IQ score starts with the concept of the 'Bell Curve,' a common way to represent IQ scores statistically. Imagine a graph where most people's IQ scores fall in the middle range, creating the highest point or 'peak' of the curve. As we move towards higher or lower scores, fewer people fall into these categories, making the curve taper off at both ends. This is why it's called a bell curve – it resembles the shape of a bell.

In this model, the average IQ is set at 100. About 68% of the population scores between 85 and 115, which is considered average intelligence. Scores above 115 are seen as above average, with those above 130 often classified as 'gifted.' Conversely, scores below 85 are considered below average.

How Our Online IQ Test Works

Step 1 Take the Test

Find a quiet environment and start the test. Try to answer the questions to be best of your ability. If you hesitate, you may skip questions and come back to them later.

Step 2 Get an IQ Score Estimate

Once you've completed the test, you'll receive a free assessment of your IQ score and a highlight of your strongest skills. This is based on a comparative analysis with a sample from our extensive database of IQ test takers.

Step 3 Download Your Certificate

Along with your precise IQ, you'll be able to download a personnalized IQ certificate and a full report, detailed peers analysis to understand where you stand, and comprehensive reports on your cognitive profile.

325 people are taking the test right now Get Started Immediate results


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Frequently Asked Questions

What is an IQ test?

An IQ test is a vital tool among several assessments designed to evaluate cognitive abilities. Essentially, it acts as a gauge of your overall intelligence. These tests typically comprise a diverse array of tasks, each targeting different facets of human intellect. These areas include abstract reasoning, where you discern patterns and relationships in complex data; pattern recognition, which involves identifying similarities and differences in sequences or designs; and analytical thinking, a skill that tests your ability to break down complex information and solve problems logically. By engaging in these varied exercises, an IQ test provides a comprehensive picture of your intellectual capabilities, offering insights into your cognitive strengths and areas for potential development.

What is an adaptive IQ test?

An adaptive IQ test, like CheckIQ, is designed to adjust the difficulty of questions in real-time based on your responses. This approach ensures that the test is personalized to your ability level, making it more accurate and efficient than traditional IQ tests. To be more specific, as you progress and respond to more questions, the algorithm continually refines this estimate based on the totality of your answers. It then selects questions that closely match your updated ability estimate. This ensures that the test remains challenging yet appropriate to your level, enhancing both the accuracy and personalization of the assessment. The final score is reflective of all your responses, taking into account the difficulty of each question you've faced, thus providing a precise measurement of your intelligence.

How long does the IQ test take?

Our IQ test takes approximately 30 minutes to complete. This duration is optimal for ensuring a thorough assessment while respecting your time.

Any prerequisites for a home IQ test?

When taking the IQ test at home, ensure you're in a quiet, distraction-free environment. The increasing difficulty of the questions requires your full concentration for the most accurate assessment.

What does an official IQ test look like?

An official IQ test does not adhere to a single, universally accepted format. However, the Wechsler Adult Intelligence Scale (WAIS) for adults and the Wechsler Intelligence Scale for Children (WISC), designed for children aged 6 to 16, are widely recognized and used. These Wechsler tests, which must be administered by certified professionals or institutions, are among the most accepted methods for assessing intelligence. Achieving a high score on these tests may qualify an individual for membership in high-IQ societies such as Mensa, Intertel, and the Triple Nine Society. The latest versions of the Wechsler tests include four main components that evaluate a range of cognitive abilities: Verbal Comprehension, Perceptual Reasoning, Working Memory, and Processing Speed. Additionally, the Wechsler test for children incorporates elements designed to assess Fluid Reasoning.

What is a good IQ score?

A good IQ score generally falls above 120. Scores in the range of 115 to 130 indicate superior intelligence, while scores above 130 are considered high, found in less than 3% of the population. Scores above 140 are rare, representing less than 0.1% and are classified as genius level. For more insights, visit our blog to understand what different IQ scores mean.

How can I increase my IQ?

Your IQ can improve over time. Engaging in tasks like the n-back task, a memory-enhancing exercise, can boost your intelligence. Our app offers a training program to address weaknesses and improve cognitive abilities. For more details, check out our blog post on using the Dual N-Back test to increase your IQ.

Is IQ inherited?

Your IQ, indicative of your level of intelligence, is influenced by both genetic and environmental factors. Factors such as your childhood environment, access to education, and nutrition play significant roles alongside genetics. For an in-depth understanding, read our blog post on the heritability of intelligence.

Is CheckIQ™ test free?

CheckIQ™ provides a free initial IQ assessment, offering an estimated score range and insights into your cognitive strengths once you complete the test. This estimate is based on a subset of our entire test-taker database, and is 100% free. To get your free IQ test estimate, simply start the IQ test from this homepage. Upon completing the test, not only will you get an estimate of your IQ, but you'll also have the option to measure your IQ across the full database of IQ test takers for a fee in order to get your precise IQ score. Additionally, you may also get a personalized IQ certificate, a customized cognitive assessment report, and detailed analytics to thoroughly understand your cognitive abilities and benchmark them against a broader population. You'll also have the opportunity to retake the IQ test to improve your score.

What is the minimum IQ for Mensa?

The minimum IQ score required to join Mensa is 130, as measured on a supervised IQ test. Mensa, the largest and oldest high IQ society in the world, generally accepts scores from the top 2% of the population. However note that the specific IQ score can vary slightly depending on the IQ test used, as different tests may have different scales.

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6000+ Questions
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